Magnesium-doped strontium titanate ceramic powder, and preparation method and application thereof

A technology of ceramic powder and strontium acid, which is applied in the field of preparation of ceramic powder materials, can solve problems such as large temperature coefficient, dielectric loss, and changing material properties, and achieve good crystallinity

Active Publication Date: 2019-01-11
LULIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it also has some defects: dielectric loss, large temperature coefficient, and high Curie temperature. However, if we dope some elements in strontium titanate, it can be modified by doping to become the matrix of inorganic non-metallic functional materials. And the main crystal phase, which will greatly change the performance of the material, so that its various properties have been significantly improved
[0005] Patent 201611047109.6, a rod-shaped Mg 2+ doped SrTiO 3 Synthetic method, recorded a rod-shaped NaTi 3 o 7 , strontium hydroxide and soluble magnesium salt for hydrothermal reaction to obtain rod-shaped magnesium-doped strontium titanate. In this patent, rod-shaped NaTi is directly used 3 o 7 React with magnesium salt to make magnesium ions doped to the rod-shaped NaTi 3 o 7 surface, and no topographical control

Method used

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  • Magnesium-doped strontium titanate ceramic powder, and preparation method and application thereof
  • Magnesium-doped strontium titanate ceramic powder, and preparation method and application thereof
  • Magnesium-doped strontium titanate ceramic powder, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Example 1 Preparation of custard apple fruit-shaped magnesium-doped strontium titanate

[0066] Anhydrous SrCl 2 And MgCl 2 Dissolved in ultrapure water, TiCl 4 Dissolve in 0.3mol / L HCl solution, respectively make 0.5mol / L solution. By mole ratio [Sr 2+ ]:[Mg 2+ ]+[Ti 4+ ] = 1.0, [Mg 2+ ]:[Mg 2+ ]+[Ti 4+ ] = 0.02 Remove the above SrCl separately 2 Solution 2.04mL and MgCl 2 Solution 0.04mL, 2.0mLTiCl 4 Mix the solution and 1.0mL glycerol evenly, slowly add 30mL 0.6mol / L NaOH solution, mix well and place in a high pressure reactor lined with tetrafluoroethylene, keep the total volume of the solution at 35mL, magnetically stir for 10mins, and install the kettle , Seal the kettle, heat it up to 200℃ and react for 6h after sealing. After the reaction is completed, the obtained precipitate is filtered, washed, and dried in vacuum at 60° C., to obtain a white powder of custard apple-like magnesium-doped strontium titanate, labeled as SMT1.

Embodiment 2

[0067] Example 2 Preparation of spherical magnesium-doped strontium titanate

[0068] The difference from the method in Example 1 is that the concentration of NaOH is 1.5mol / L, the additive is changed from glycerol to 1.5mL ethanol, the reaction time is extended to 8h, and the reaction temperature is changed to 180°C to obtain spherical magnesium-doped titanic acid. Strontium, labeled SMT2.

Embodiment 3

[0069] Example 3 Preparation of Custard Apple-like Magnesium Doped Strontium Titanate

[0070] Anhydrous SrCl 2 And MgCl 2 Dissolved in ultrapure water, TiCl 4 Dissolve in 0.3mol / L HCl solution, respectively make up 0.7mol / L solution. By mole ratio [Sr 2+ ]:[Mg 2+ ]+[Ti 4+ ] = 1.0, [Mg 2+ ]:[Mg 2+ ]+[Ti 4+ ] = 0.02 Remove the above SrCl separately 2 Solution 2.1mL and MgCl 2 Solution 0.04mL, 2.0mLTiCl 4 Mix the solution and 1.0mL glycerol evenly, slowly add 30mL 0.6mol / L NaOH solution, mix well and place in a high pressure reactor lined with tetrafluoroethylene, keep the total volume of the solution at 35mL, magnetically stir for 10mins, and install the kettle , Seal the kettle, heat it up to 200℃ and react for 7h after sealing. After the reaction is completed, the obtained precipitate is filtered, washed, and dried in vacuum at 60° C., to obtain a white powder of custard apple-like magnesium-doped strontium titanate, labeled as SMT1.

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Abstract

The invention belongs to the technical field of preparation of ceramic powder materials, and relates to a magnesium-doped strontium titanate ceramic powder, and a preparation method and an applicationthereof. A reaction is carried out at a certain temperature under a hydrothermal condition for a certain time with titanium tetrachloride as a titanium source, sodium hydroxide as a mineralizer and dilute hydrochloric acid as a hydrolysis inhibitor in order to obtain the magnesium-doped strontium titanate powder, and a result of FT-IR analysis shows that the product contains no impurities, and isa pure substance. The internal structure and the surface of the final product magnesium-doped strontium titanate are investigated by XRD, ICP, SEM, TEM and CA. Results show that the magnesium-doped strontium titanate obtained by controlling the reaction temperature, the reaction time, the NaOH concentration and the addition amount of glycerol has a good crystal phase, crystal grains have a custard apple-like shape, and the particle size is 2.0 [mu]m. Spherical magnesium-doped strontium titanate is obtained by changing conditions, and a result of comparison of the dielectric properties of thecustard apple-like magnesium-doped strontium titanate and the spherical magnesium-doped strontium titanate shows that the custard apple-like magnesium-doped strontium titanate has good dielectric responsiveness.

Description

Technical field [0001] The invention belongs to the technical field of ceramic powder material preparation, and specifically relates to a magnesium-doped strontium titanate ceramic powder and a preparation method and application thereof. Background technique [0002] Strontium titanate (SrTiO 3 , Abbreviated as STO) is an important basic electronic ceramic material. It has excellent properties such as high dielectric constant, ferroelectricity, piezoelectricity and positive temperature coefficient, so it has a wide range of applications in many fields. But it also has some shortcomings: dielectric loss, large temperature coefficient, and high Curie temperature. However, if we dope some elements in strontium titanate, doping modification becomes the matrix of inorganic non-metallic functional materials. And the main crystalline phase, this will greatly change the properties of the material, so that its various properties have been significantly improved. Therefore, the preparatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/626
CPCC04B35/47C04B35/626C04B2235/3206C04B2235/444C04B2235/786
Inventor 高淑娟王炎李林枝
Owner LULIANG UNIV
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